JP2008223431A - Earthquake resisting construction method of structure, construction method of structure, earthquake resisting structure of structure, anchor and anchor installation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for performing earthquake resisting reinforcement to a structure without soil improvement. <P>SOLUTION: In this earthquake resisting construction method for the structure 4, a hole 20 is provided to penetrate the structural body 2 of the structure 4 supported on the ground 1 to reach an anchor ground 1a of an anchor, and the upper end of the anchor 5 is fixed to the structural body 2. At least a part of a portion of the anchor 5 located above the anchor ground 1a is taken as a bond part 9a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seismic construction method for a structure, a structure construction method, a seismic structure for a structure, an anchor, and an anchor installation method.

As an example of a seismic construction method for applying seismic reinforcement to a structure, a seismic construction method using an anchor is disclosed in Patent Document 1 and Patent Document 2.
The earthquake-proof method described in Patent Document 1 is to drill a hole from an existing floor slab of an existing structure or a new floor slab toward the support layer of the ground, and place an anchor in this hole. The anchor tip is fixed to the anchor ground (support layer) with a grout material, and tension is applied to the anchor to improve the seismic performance of the structure.

  In addition, the earthquake-proof method described in Patent Document 2 is that an anchor is driven through a footing arranged at the top of a pile foundation, the tip of this anchor is fixed on the fixed ground of the ground, and tension is applied to the anchor. By attaching the upper end of the anchor to the footing, the seismic performance of the structure arranged on the upper part of the footing is improved.

In the above case, only the tip of the anchor is formed in the fixing length portion fixed to the fixing ground of the ground, and the portion other than the tip of the anchor is formed in a stretchable free length portion, and when applying tension to the anchor The tension can be adjusted by expanding and contracting the free length.
JP-A-10-202393 Japanese Patent Laid-Open No. 10-82057

  By the way, in the seismic construction method having the above-described configuration, when an excessive horizontal force due to a large earthquake is input to the structure, the horizontal force causes elongation in the free long portion of the anchor. Therefore, in order to prevent the structure from collapsing due to excessive expansion and contraction of the anchor in the event of a large earthquake, it is necessary to apply tension (e.g., 100 to 200 tons) corresponding to the elongation to the anchor in advance. There is. At that time, if the ground is soft, the ground must be improved so that it can withstand the tension of the anchor, and the strength of the ground must be increased. The cost is high.

  The present invention has been made in view of the above-described conventional problems, and it is possible to reduce tension applied in advance to an anchor when improving the earthquake resistance of the structure by the anchor. With the goal.

In order to solve the above problems, the present invention employs the following means.
That is, the invention according to claim 1 is provided with a hole that penetrates the structure of the structure supported by the ground to reach the anchoring ground of the anchor, and the anchor is placed in the hole so that the tip of the anchor A seismic construction method for a structure in which the anchor is fixed to the fixing ground and the upper end of the anchor is fixed to the structure, wherein at least a part of the anchor positioned above the fixing ground is a bond portion. Features.

According to the seismic construction method for a structure according to the present invention, at least a part of the portion located above the anchor fixing ground is fixed to the ground around the hole as a bond portion. The length of the part can be shortened.
Therefore, as the free length is shortened, the amount of anchor extension during a large earthquake is reduced, so only the anchor tip is fixed on the fixed ground, and all other parts are not fixed on the ground. Compared to the conventional method, the tension force to be applied to the anchor can be greatly reduced.

  The invention according to claim 2 is the earthquake proofing method for the structure according to claim 1, wherein the anchor has a concave and convex portion on the inner and outer peripheral surfaces inserted until the tip reaches the fixing ground in the hole. And a steel wire inserted into the sheath tube until the tip reaches the fixing ground.

  According to the seismic construction method for a structure according to the present invention, the tip of the anchor sheath tube and the steel wire is fixed to the fixing ground, and at least a part of the anchor sheath tube and the steel wire positioned above the fixing ground is a bond portion. Will be established on the surrounding ground.

  The invention according to claim 3 is the earthquake-proof method for the structure according to claim 2, wherein the bond portion injects a grout material between the steel wire and the sheath tube, and the sheath tube and the hole The grout material is injected between the surrounding grounds of the steel sheet, and the steel wire, the sheath tube, and the surrounding ground of the hole are integrated and fixed.

  According to the seismic construction method for a structure according to the present invention, the grout material is injected between the steel wire and the sheath tube, and the grout material is injected between the sheath tube and the ground surrounding the hole, so that the steel of the bond portion of the anchor can be obtained. The wire and the sheath tube are integrated and fixed to the ground around the hole.

  The invention according to claim 4 is the seismic construction method for a structure according to any one of claims 1 to 3, wherein the anchor is fixed to the structure with an upper end of the anchor in a state where tension is applied. It is characterized by

  According to the seismic construction method for a structure according to the present invention, the upper end of the anchor is fixed to the structure in a state where tension is applied.

  The invention according to claim 5 is the seismic construction method for a structure according to any one of claims 1 to 3, wherein the anchor is attached to the structure with an upper end of the anchor in a state where no tension is applied. It is characterized by fixing.

  According to the seismic construction method for a structure according to the present invention, the upper end of the anchor is fixed to the structure without tension.

  The invention according to claim 6 is the seismic construction method for a structure according to any one of claims 1 to 5, wherein the anchor is fixed to the structure body through a fixing tool. .

  According to the seismic construction method for a structure according to the present invention, the anchor is fixed to the head of the structure via the fixing tool.

  The invention according to claim 7 is the seismic construction method for the structure according to any one of claims 1 to 6, wherein the structure is a foundation, an underground beam, or a pressure plate of the structure. And

  According to the seismic construction method for a structure according to the present invention, the upper end of the anchor is fixed to the foundation of the structure, the underground beam or the pressure plate.

  The invention according to claim 8 is a method for constructing a structure, wherein the structure of the structure is provided on the ground, a hole that penetrates the structure and reaches the anchoring ground of the anchor is provided, and the anchor is provided in the hole. To fix the tip of the anchor to the fixing ground, to fix the upper end of the anchor to the structure in a state where tension is applied to the anchor or in a state where tension is not applied to the anchor, At least a part of a portion of the anchor located above the fixing ground is a bond portion.

  The invention according to claim 9 is a seismic structure of a structure supported by the ground, and is driven into a hole that penetrates the structure of the structure and reaches the anchoring ground of the anchor, and a tip thereof is the anchoring ground. And an anchor whose upper end is fixed to the structure in a state where tension is applied or in a state where tension is not applied, and at least one portion of the anchor positioned above the fixing ground The portion is a bond portion.

  The invention according to claim 10 is placed in a hole that penetrates the structure of the structure supported by the ground and reaches the anchoring ground of the anchor, the tip is fixed to the anchoring ground, and tension is applied. An anchor whose upper end is fixed to the structure in a state where the tension is applied or in a state where no tension is applied, and at least a part of a portion located above the fixing ground is a bond portion. .

  According to the eleventh aspect of the present invention, the tip of the anchor is fixed to the fixing ground and is applied with tension as it passes through the structure of the structure supported by the ground and reaches the fixing ground of the anchor. The anchor is installed in the state where the upper end is fixed to the structure in a state where the tension is not applied or the tension is not applied, and at least a part of the portion located above the fixing ground is a bond part. Features.

As described above, according to the present invention, at least a part of the portion located above the anchoring ground of the anchor that supports the structure is used as the bond portion, so that the seismic performance of the structure is improved by the anchor. In this case, it is possible to reduce the tension that should be previously applied to the anchor.
Therefore, since the seismic performance of the structure can be improved without improving the ground, the cost required for ground improvement can be reduced, and the cost required for seismic reinforcement of the structure can be kept low.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 7 show an embodiment of a seismic construction method for a structure according to the present invention. FIG. 1 is an explanatory view showing a hole drilling step, and FIG. 2 is an explanatory view showing an anchor insertion step. 3 is an explanatory view showing an inner grout injection step, FIG. 4 is an explanatory view showing an outer grout injection step, FIG. 5 is an explanatory view showing a casing drawing step, and FIG. 6 is an explanatory view showing a tension applying step, FIG. 7 is an explanatory view showing a state after anchor placement.

  That is, as shown in FIG. 7, the seismic construction method for a structure shown in the present embodiment includes a structure 4 such as a building supported on the ground 1 via a structure (for example, an existing foundation 2). This is effective for seismic reinforcement, and the permanent anchor 5 is placed between the foundation 2 of the structure 4 and the anchor ground 1a (for example, a support layer). The seismic performance is improved.

  In this case, the portion of the permanent anchor 5 that is located in the fixed ground 1a of the ground 1 and the ground that is located above the fixed ground 1a (in this embodiment, for example, the soft ground 1b). At least a portion is configured as a non-stretchable fixing length portion 15, and the other portion is configured as a stretchable free length portion 16.

  Various permanent anchors can be used as the permanent anchor 5. As shown in FIG. 7, the permanent anchor 5 according to the present embodiment includes a sheath tube 6 (for example, a bellows-shaped corrugated sheath) having an unevenness on the inner and outer peripheral surfaces made of synthetic resin, and the vicinity of the distal end portion of the sheath tube 6. A first water blocking material 7 provided on the inner peripheral side, a second water blocking material 8 provided on the inner peripheral side in the vicinity of the upper end portion of the sheath tube 6, and the second water blocking material 8 and penetrating through the sheath tube 6. A plurality of steel wires 9 (for example, PC steel strands) inserted into the steel wire 9, a fixing tool 22 attached to a portion of the steel wire 9 positioned above the second water stop material 8, and a second stop An inner injection pipe 18 through which the tip is inserted to the vicinity of the lower end of the sheath tube 6 through the water material 8, and the tip of the sheath tube 6 through the second water stop material 8 and the first water stop material 7 are inserted. And an outer injection tube 19 that protrudes downward from the tip.

Placing the permanent anchor 5 having the above-described configuration is performed by a drilling process, an anchor insertion process, an inner grout injection process, an outer grout injection process, a casing pulling process, and a tension applying process described later.
Hereinafter, each step will be described in detail.

(1) Drilling step First, as shown in FIG. 1, using a drilling machine (not shown), a predetermined hole reaching the anchor fixing ground 1a through the foundation 2 supporting the structure 4 is obtained. Holes 20 having a diameter and a depth are drilled at a plurality of locations, and a cylindrical casing 21 is left in each hole 20. In this embodiment, a rotary percussion self-propelled drilling machine in which a drilling machine and an injection device for injecting grout material are integrated is used.

(2) Anchor insertion process Next, as shown in FIG. 2, the permanent anchor 5 assembled beforehand is inserted inside the casing 21 in each hole 20, and the sheath tube 6 and each steel wire 9 of the permanent anchor 5 are inserted. The upper ends of the sheath tube 6 and the steel wires 9 are protruded upward from the foundation 2 of the structure 4.

(3) Inner Grout Injection Step Next, as shown in FIG. 3, an injection device (not shown) is driven to inject a grout material from the injection device into the sheath tube 6 through the inner injection tube 18. The grout material 10 is filled between the first water-stopping material 7 and the second water-stopping material 8 in the pipe 6 and cured.

In this case, as shown in FIG. 7, a portion of each steel wire 9 located in the fixing ground 1a and a portion located in the soft ground 1b are formed in the bond portion 9a in advance. The other part of the steel wire 9 is formed in the unbonded part 9b.
FIG. 8 shows a cross-sectional view of the bond portion 9a, and FIG. 9 shows a cross-sectional view of the unbond portion 9b. As shown in FIGS. 8 and 9, the surface of the bond portion 9a is exposed, and the surface of the unbond portion 9b is covered with a coating material 9c.

  By forming each steel wire 9 in the structure as shown in FIGS. 8 and 9, each steel wire 9 is fixed to the sheath tube 6 via the grout material 10 in each bond portion 9a, and each unbond portion 9b. Then, since the covering material 9 c is interposed between each steel wire 9 and the sheath tube 6, each steel wire 9 is not fixed to the sheath tube 6 and can freely expand and contract.

  In this embodiment, the entire portion of each steel wire 9 located in the fixing ground 1a and the portion located in the soft ground 1b between the fixing ground 1a and the foundation 2 are bonded. A portion that is formed in the portion 9a and is located in the foundation 2 of each steel wire 9 and a portion that is located above the foundation 2 are formed in the unbonded portion 9b. Therefore, the part corresponding to the bond part 9a located in the fixing ground 1a and the soft ground 1b of each steel wire 9 becomes the fixing length part 15 which cannot expand and contract, and is located in the foundation 2 of each steel wire 9. The portion and the portion corresponding to the unbonded portion 9b located above the base 2 become the free length portion 16 that can be expanded and contracted.

(4) Outer grout injection process, casing extraction process Next, as shown in FIGS. 4 and 5, a hole 20 below the first water stop material 7 from the injection device (not shown) through the outer injection pipe 19. The casing 21 is pulled out from the hole 20 while the grouting material 10 is injected under pressure to the bottom of the grouting material 10, and the grouting material 10 is placed in the gap between the bottom of the hole 20 and the inner peripheral surface of the hole 20 and the outer peripheral surface of the sheath tube 6. Fill the whole and cure.

In this case, since the sheath tube 6 has irregularities on the inner and outer peripheral surfaces, the sheath tube 6 is firmly fixed to the inner peripheral surface of the hole 20 via the grout material 10, the sheath tube 6 is integrated with the ground 1, and the hole Slip in the axial direction is prevented between the inner peripheral surface 20 and the outer peripheral surface of the sheath tube 6.
The sheath tube 6 only needs to have a tubular shape having irregularities on the inner and outer peripheral surfaces.

  In this way, the bond portions 9a of the plurality of steel wires 9 are fixed to the inner peripheral surface of the sheath tube 6 via the grout material 10, and the outer peripheral surface of the sheath tube 6 is placed inside the hole 20 via the grout material 10. By fixing to the peripheral surface, the bond portions 9a of the plurality of steel wires 9 are fixed to the fixing ground 1a and the soft ground 1b, and the portion of the plurality of steel wires 9 located in the ground 1 is the ground 1. Will be completely integrated.

(5) Tensile force imparting step As shown in FIG. 6, after fixing the bond portions 9 of the plurality of steel wires 9 to the ground 1, they protrude upward from the upper part of the foundation 2 of the plurality of steel wires 9. Attach a jack (not shown) to the part, apply a predetermined tension to the multiple steel wires 9 by operating the jack, and fix the upper ends of the multiple steel wires 9 in this state as described above The head is fixed to the base 2 with the tool 22.

  In this case, the fixing tool 22 is mounted on the upper portion of the foundation 2 and has a support plate 23 provided with a plurality of holes (not shown) through which each steel wire 9 is inserted, and each hole of the support plate 23. A wedge-shaped locking claw (not shown) engaged inside and a cap 24 mounted on the upper part of the pressure bearing plate 23 are used. However, the present invention is not limited to this, as long as each steel wire 9 has a function capable of fixing the head to the foundation 2 in a tensioned state.

  In this way, the structure 4 is integrated with the fixed ground 1 a of the ground 1 through the permanent anchor 5, and the structure 4 is subjected to seismic reinforcement.

  In the seismic construction method for a structure according to the present embodiment configured as described above, the portion of each steel wire 9 of the permanent anchor 5 located in the fixed ground 1a and the soft ground 1b. A portion located in the foundation 2 of each steel wire 9 is formed in the unbonded portion 9b, and the bond portion 9a is formed as a fixing length portion 15 integrated with the ground 1 to form an unbonded portion. 9b is the free length portion 16, so that the length of the free length portion 16 can be significantly shortened compared to the conventional construction method in which only the tip of each steel wire 9 is fixed to the fixing ground and used as the fixing length portion. it can.

  Therefore, in order to prevent the steel wires 9 of the permanent anchor 5 from being excessively extended in the event of a large earthquake, the tension applied in advance to each steel wire 9 can be greatly reduced. The seismic performance of the structure 4 can be improved without performing ground improvement on the ground 1b, and the cost required for the seismic reinforcement of the structure 4 can be greatly reduced.

  In addition, in said description, although the whole part located in the soft ground 1b of each steel wire 9 was formed in the bond part 9a, of the part located in the soft ground 1b of each steel wire 9 You may form a part in bond part 9a. In short, a portion to be formed in the bond portion 9a may be appropriately set according to the state of the ground 1.

  In the above description, the permanent anchor 5 subjected to complete anticorrosion and rust prevention treatment is used. Although not shown, depending on the state of the ground on which the structure 4 is installed, simple anticorrosion and rust prevention is provided. Temporary anchors that have been treated or not subjected to anticorrosion or rust prevention treatment may be used. Since the temporary anchor does not have a sheath tube, the bond portion of each steel wire is directly fixed to the inner surface of the hole provided in the ground via the grout material, and the unbonded portion covers the surface. In this case, the same effect as the permanent anchor 5 can be obtained.

In the above embodiment, the case where the foundation of the existing structure is reinforced is described. However, the present invention can also be applied to the case where the foundation of the structure is newly installed. The anchor may be placed so as to penetrate the foundation, and after the strength of the concrete of the foundation is expressed, the anchor may be fixed to the foundation. It should be noted that the order of the foundation concrete placement and the anchor placement does not matter.
Furthermore, in the above embodiment, the anchor upper end is fixed to the anchor in a state where tension is applied to the anchor. However, the anchor upper end may be fixed to the anchor in a state where tension is not applied to the anchor. .
Furthermore, in the above embodiment, the foundation 2 has been described as an example of a structure that supports the structure. However, the structure is not limited to the foundation 2, and an underground beam, a pressure plate, or the like that supports the structure may be used as the structure.

It is explanatory drawing which showed one Embodiment of the earthquake-proof reinforcement method of the structure by this invention, Comprising: It is explanatory drawing which showed the drilling process of the hole. It is explanatory drawing which showed the anchor insertion process. It is explanatory drawing which showed the inner grout injection | pouring process. It is explanatory drawing which showed the outer grout injection | pouring process. It is explanatory drawing which showed the extraction process of the casing. It is explanatory drawing which showed the tension | tensile_strength provision process. It is explanatory drawing which showed the state after placement of a permanent anchor. It is AA sectional drawing of the free length part of the permanent anchor of FIG. It is BB sectional drawing of the fixing length part of the permanent anchor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground 1a Fixed ground 1b Soft ground 2 Foundation 4 Structure 5 Permanent anchor 6 Sheath pipe 7 1st water stop material 8 2nd water stop material 9 Steel wire 9a Bond part 9b Unbond part 9c Cover material 10 Grout material 15 Fixation long part 16 Free length 18 Inner injection pipe 19 Outer injection pipe 20 Hole 21 Casing 22 Fixing tool 23 Bearing plate 24 Cap

Claims (11)

A hole that penetrates the structure of the structure supported by the ground and reaches the anchoring ground of the anchor is provided, and an anchor is placed in the hole to fix the tip of the anchor to the anchoring ground, and the upper end of the anchor Is a seismic construction method for a structure to be fixed to the structure,
A seismic construction method for a structure, wherein at least a part of a portion of the anchor located above the fixing ground is a bond portion.   The anchor is inserted into the hole until the tip reaches the fixing ground, a sheath tube having irregularities on the inner and outer peripheral surfaces, and inserted into the sheath tube, and is inserted until the tip reaches the fixing ground. The seismic construction method for a structure according to claim 1, comprising a steel wire.   The bond portion injects a grout material between the steel wire and the sheath tube, and injects a grout material between the sheath tube and the ground surrounding the hole, so that the steel wire, the sheath tube, and the hole are injected. The seismic construction method for a structure according to claim 2, wherein the structure is a fixed part integrated with the surrounding ground.   The seismic construction method for a structure according to any one of claims 1 to 3, wherein an upper end of the anchor is fixed to the structure in a state where tension is applied.   The seismic construction method for a structure according to any one of claims 1 to 3, wherein an upper end of the anchor is fixed to the structure in a state where tension is not applied.   The seismic construction method for a structure according to any one of claims 1 to 5, wherein the anchor is fixed to a head portion of the anchor by a fixing tool.   The seismic construction method for a structure according to any one of claims 1 to 6, wherein the structure is a foundation, an underground beam, or a pressure plate of the structure. A construction method of a structure,
Providing the structure of the structure on the ground, providing a hole penetrating the structure to reach the anchoring ground of the anchor, driving the anchor into the hole and fixing the tip of the anchor to the anchoring ground; At least a part of a portion of the anchor positioned above the anchoring ground, with the upper end of the anchor fixed to the structure with tension applied to the anchor or without tension applied to the anchor The construction method of the structure characterized by using as a bond part. An earthquake-resistant structure of a structure supported by the ground,
It is placed in a hole that penetrates the structure of the structure and reaches the anchoring ground of the anchor, the tip is fixed to the anchoring ground, and the upper end is in a state of applying tension or not applying tension Comprising an anchor fixed to the structure,
An earthquake-resistant structure for a structure, wherein at least a part of a portion of the anchor located above the fixing ground is a bond portion. It is placed in a hole that penetrates the structure of the structure supported by the ground and reaches the anchoring ground of the anchor, the tip is fixed to the anchoring ground, and the tensioning force is applied to the anchoring ground. An anchor whose upper end is fixed to the structure without being applied,
An anchor characterized in that at least a part of a portion located above the fixing ground is a bond portion. It is placed in a hole that penetrates the structure of the structure supported by the ground and reaches the anchoring ground of the anchor, the tip is fixed to the anchoring ground, and the tensioning force is applied to the anchoring ground. An anchor installation method in which the upper end is fixed to the structure without being provided,
An anchor installation method characterized in that at least a part of a portion located above the fixing ground is a bond portion.

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